Men’s 100-meter finals, 4:45 p.m. Eastern: One of the centerpieces of any global meet, the men’s 100-meter final, caps off the day. In the likely scenario he makes the final, the race will be Usain Bolt’s last bid for a global title. Since the 2008 Olympics, the only blot on his 100-meter record in global meets was Worlds in 2011, when he was disqualified for a false start. Bolt is unquestionably the greatest sprinter in history. But he’s also unquestionably not the sprinter he was a few years ago. He broke 10 seconds, the benchmark for world-class 100-meter times, only once heading into this meet. The question is whether Bolt’s 93 percent of perfect enough to beat others’ 100 percent?

Two key challengers should be U.S. champion Justin Gatlin, who was second to Bolt in the Olympics last year and the two previous Worlds finals, and Christian Coleman, second at the U.S. championships, who has the fastest time of the year going into the meet. But medaling at this level is as much about navigating four races in two days with the right amount of effort as it is about a one-and-done burst of speed.

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Women’s 10,000-meter final, 3:10 p.m. Eastern: There’s significant uncertainty surrounding the women’s 10,000. On paper, it should come down to a duel between two Ethiopians: Almaz Ayana, who broke the world record while winning last year’s Olympics, and Tirunesh Dibaba, who won the two previous Olympic titles. But Ayana has been struggling with injury and hasn’t raced since September. Dibaba’s races this year have all been on the roads, including a 2:17:56 runner-up finish at the London Marathon in April. That performance made her the third fastest woman in history over 26.2 miles. What’s unclear is how well she can return to her track roots and the killer last-lap kick that won her not only those two Olympic 10Ks but three world titles at the distance, as well as one Olympic and two world titles at 5,000 meters. (Dibaba’s first world 5K gold came in 2003!)

The Kenyan trio is led by Alice Aprot, who forced the pace early in the Olympics last year before fading to fourth. She and her teammates Agnes Tirop and Irene Cheptai, who are the two most recent world cross-country champions, will need to run similarly on Sunday to break Ayana and Dibaba before the last two laps. If not, they’re likely to lose to the Ethiopians’ superior sprints.

Molly Huddle broke the U.S. record in finishing sixth at last year’s Olympics. Like the Kenyans, she’ll do best with a strong pace for most of the race, and she won’t be afraid to lead if necessary to keep things going. At Worlds two years ago, Huddle famously lost the bronze medal to teammate Emily Infeld by easing up at the finish line. Infeld is back for London, the only medalist from the 2015 Worlds race to return. She recently broke 15:00 for 5,000 meters for the first time, so she’s fit, but she’ll need a slow, tactical race if she wants to medal again. Huddle’s training partner Emily Sisson rounds out the U.S. squad and will do well to place in the top 10 in her first race of this caliber.

Also: The semifinals of the women’s 1500 set the field for Monday’s final. American Jenny Simpson has two Worlds medals, including a gold, and the bronze from last year’s Olympics. She’ll want to advance to the final as efficiently as possible. The first two rounds of this event will give more of a hint if world record-holder and defending world champ Genzebe Dibaba is near her otherworldly form of two years ago, or if she’ll be one of a handful of women Simpson will battle for medals.

The first round of the men’s 800 sets the field for Sunday’s semifinals. Two-time Olympic and world champion David Rudisha of Kenya, who is also the world record-holder, withdrew from the meet earlier this week because of injury. There’s now no clear favorite in this always-tumultuous event. Emmanual Korir of Kenya has the fastest time of the year, while 2012 Olympic silver medalist Nijel Amos of Botswana has the most global-meet experience of the top contenders. The U.S. champion, Donovan Brazier, has tons of raw talent, but will need to combine that with tactical savvy to advance through rounds at this level of competition.

The first round of the women’s 100 winnows the field before Sunday’s semifinals and final. Expect the final to be another U.S.-Jamaica clash, although Dafne Schippers of the Netherlands, who’s more of a threat at 200 meters, should also be a factor.

Scott DouglasScott is a veteran running, fitness, and health journalist who has held senior editorial positions at Runner’s World and Running Times.

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